Three Al-Jazeera journalists have been arrested for the alleged illegal flying of a drone in Paris after being spotted by police in the Bois de Boulogne area.

A spokesman for prosecutors said there was "no relationship for the moment" between the arrests and mysterious drone flights over the city at night.

Al-Jazeera said the journalists had been "filming a report on the city's recent mystery drones".

Drones were spotted over city landmarks for a second night running on Tuesday.

Flying drones over Paris without a license is banned by law.

The offence carries a maximum one-year prison sentence and a €75,000 fine.

A judicial source told AFP news agency of the three people arrested: "The first was piloting the drone, the second was filming and the third was watching."

The names and nationalities of the journalists have not been released. Al-Jazeera is a Qatar-based satellite TV channel.